Verified 1.1ubuntu1.18.04.7 on Bionic: ... root@uu-shutdown-test:~# service unattended-upgrades status ● unattended-upgrades.service - Unattended Upgrades Shutdown Loaded: loaded (/lib/systemd/system/unattended-upgrades.service; enabled; vendor preset: enabled) Active: active (running) since Wed 2018-11-28 16:06:14 UTC; 1s ago Docs: man:unattended-upgrade(8) Main PID: 230 (unattended-upgr) Tasks: 2 (limit: 4915) CGroup: /system.slice/unattended-upgrades.service └─230 /usr/bin/python3 /usr/share/unattended-upgrades/unattended-upgrade-shutdown --wait-for-signal Nov 28 16:06:14 uu-shutdown-test systemd[1]: unattended-upgrades.service: Failed to reset devices.list: Operation not permitted Nov 28 16:06:14 uu-shutdown-test systemd[1]: Started Unattended Upgrades Shutdown. root@uu-shutdown-test:~# vi /etc/apt/sources.list root@uu-shutdown-test:~# apt update Hit:1 http://archive.ubuntu.com/ubuntu bionic InRelease Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB] Get:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB] Get:4 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB] Fetched 247 kB in 0s (505 kB/s) Reading package lists... Done Building dependency tree Reading state information... Done 6 packages can be upgraded. Run 'apt list --upgradable' to see them. root@uu-shutdown-test:~# echo 'Unattended-Upgrade::InstallOnShutdown "true";' > /etc/apt/apt.conf.d/51unattended-upgrades-on-shutdown root@uu-shutdown-test:~# echo 'Unattended-Upgrade::Allowed-Origins:: "${distro_id}:${distro_codename}-updates";' > /etc/apt/apt.conf.d/51unattended-upgrades-updates-too root@uu-shutdown-test:~# root@uu-shutdown-test:~# apt install snapd=2.32.5+18.04 Reading package lists... Done Building dependency tree Reading state information... Done The following package was automatically installed and is no longer required: libfreetype6 Use 'apt autoremove' to remove it. The following packages will be DOWNGRADED: snapd 0 upgraded, 0 newly installed, 1 downgraded, 0 to remove and 6 not upgraded. Need to get 12.2 MB of archives. After this operation, 860 kB disk space will be freed. Do you want to continue? [Y/n] Get:1 http://archive.ubuntu.com/ubuntu bionic/main amd64 snapd amd64 2.32.5+18.04 [12.2 MB] Fetched 12.2 MB in 0s (75.4 MB/s) dpkg: warning: downgrading snapd from 2.34.2+18.04 to 2.32.5+18.04 (Reading database ... 28538 files and directories currently installed.) Preparing to unpack .../snapd_2.32.5+18.04_amd64.deb ... Unpacking snapd (2.32.5+18.04) over (2.34.2+18.04) ... Setting up snapd (2.32.5+18.04) ... Installing new version of config file /etc/apparmor.d/usr.lib.snapd.snap-confine.real ... Installing new version of config file /etc/profile.d/apps-bin-path.sh ... snapd.snap-repair.service is a disabled or a static unit, not starting it. Processing triggers for man-db (2.8.3-2ubuntu0.1) ... root@uu-shutdown-test:~# unattended-upgrade --download-only root@uu-shutdown-test:~# dbus-send --system --print-reply --dest=org.freedesktop.login1 /org/freedesktop/login1 "org.freedesktop.login1.Manager.Reboot" boolean:false method return time=1543421249.487619 sender=:1.4 -> destination=:1.10 serial=18 reply_serial=2 root@uu-shutdown-test:~# tail -f /var/log/unattended-upgrades/unattended-upgrades-dpkg.log Log started: 2018-11-28 16:07:34 (Reading database ... 28535 files and directories currently installed.) Preparing to unpack .../git_1%3a2.17.1-1ubuntu0.4_amd64.deb ... Unpacking git (1:2.17.1-1ubuntu0.4) over (1:2.17.1-1ubuntu0.3) ... Setting up git (1:2.17.1-1ubuntu0.4) ... Log ended: 2018-11-28 16:07:39 Log started: 2018-11-28 16:07:40 (Reading database ... 28535 files and directories currently installed.) Preparing to unpack .../git-man_1%3a2.17.1-1ubuntu0.4_all.deb ... Unpacking git-man (1:2.17.1-1ubuntu0.4) over (1:2.17.1-1ubuntu0.3) ... Setting up git-man (1:2.17.1-1ubuntu0.4) ... Processing triggers for man-db (2.8.3-2ubuntu0.1) ... Log ended: 2018-11-28 16:07:43 Log started: 2018-11-28 16:07:43 (Reading database ... 28535 files and directories currently installed.) Preparing to unpack .../snapd_2.34.2+18.04_amd64.deb ... Unpacking snapd (2.34.2+18.04) over (2.32.5+18.04) ... Setting up snapd (2.34.2+18.04) ... Installing new version of config file /etc/apparmor.d/usr.lib.snapd.snap-confine.real ... Installing new version of config file /etc/profile.d/apps-bin-path.sh ... snapd.snap-repair.service is a disabled or a static unit, not starting it. Processing triggers for man-db (2.8.3-2ubuntu0.1) ... Log ended: 2018-11-28 16:07:48 Log started: 2018-11-28 16:07:49 (Reading database ... 28538 files and directories currently installed.) Preparing to unpack .../sosreport_3.6-1ubuntu0.18.04.2_amd64.deb ... Unpacking sosreport (3.6-1ubuntu0.18.04.2) over (3.5-1ubuntu3.18.04.1) ... Setting up sosreport (3.6-1ubuntu0.18.04.2) ... Processing triggers for man-db (2.8.3-2ubuntu0.1) ... Log ended: 2018-11-28 16:07:53